finish map getters & setters

[incanus]

This rounds out the rest of the getter & setter functionality for the map and the requisite transform equivalents under the hood, adds animation options to any methods missing it, condenses code duplication across routines, and fixes a couple issues in related code.

• adds getLonLat & setLonLat (with animation)
• adds getZoom & setZoom (with animation)
• adds resetZoom
• adds animation to rotateBy & setAngle
• adds getLonLatZoom and setLonLatZoom (with animation)
• adds private Transform::setScaleXY (with animation) for simultaneous xyz animation transforms
• adds missing default center point for setScale
• fixes issue with x/y changing when only changing zoom

Would love someone else (@kkaefer?) to take a peek, then I can rebase & merge in another PR.